Im out of ideas. Please help ID my O2 problem

[joecar]

According to the NB it's reading lean when it's not actually lean or the wideband wouldn't show it's going too rich. If you had an air leak your wideband would register lean and the NB trims would pull it back to stoich, then when the leak is stopped it would be rich till the fuel trims re-adjusted for the non leaky intake.

Unless my logic is flawed, I don't think you can have an air leak based on your logs.

I feel your pain on this one. Wiring is no fun to troubleshoot

Yes, his first pic shows NBO2 voltage trending high/rich and IBPW adding fuel, this messes with our minds.


Thinking Out Loud (TOL):
If it was a misfire, the NBO2 would show a low/lean voltage (since NBO2 sensor sees oxygen content), and this is not what is shown in his pic.


+1 wiring problems are difficult.

[wcj]

Well, no better way to test if the rewiring of my bank1 O2 fixed the problem than a 2 hr 30 mile commute this morning.

Electrical problems are just weird I guess. Nothing I tested would repro the problem but a new harness and I can drive for 2 hrs in stop and go traffic with the AC on without a hiccup.

Thanks for all the help.

[joecar]

Cool glad you got it sorted out.


Does your old harness show signs of damage...?

[wcj]

Im just glad to confirm it wasnt my incompetent tune that's caused this problem. Joe, I think this may be related/cause of the stalling/idling problem you tried to help me with in May 2012.

To tell you the truth, I didnt bother pulling the old harness. Didnt want to try to figure out the logistics of getting the old wires out so I opted to just run a new harness for B1S1 from plug to terminals (hi/low PCM, GND, + Fuse). Since the terminals in the PCM had to be pulled and was replaced with the new terminals from the new harness, I just clipped and soldered the new GND and + wires back into the factory fuse and GND locations.

[Wheelz]

Congrats! Nice to know you found it

[wcj]

Congrats! Nice to know you found it

and all it took was 5 pages of updates and 45 days to do what you posted in Post #2!

[Wheelz]

and all it took was 5 pages of updates and 45 days to do what you posted in Post #2!

We all are lucky on occasion!!